Question

use algebra tiles to find $(-5x^{2} + 5x - 9) + (3x^{2} + 4x)$. combine like terms. for example, write 3 instead of 1 + 1 + 1.

Explanation:

Step1: Combine $x^2$ terms

$(-5x^2) + 3x^2 = (-5+3)x^2 = -2x^2$

Step2: Combine $x$ terms

$5x + 4x = (5+4)x = 9x$

Step3: Combine constant terms

$-9 + 0 = -9$

Step4: Sum all combined terms

$-2x^2 + 9x - 9$

Answer:

$-2x^2 + 9x - 9$